/* 图片等比缩小 */
function img_zoom_re(obj, frame_width, frame_height) {
  var img = null;
  img = document.createElement("img");
  img.src = obj.src;
  if (img.width > frame_width || img.height > frame_height) {
    if (img.width / frame_width > img.height / frame_height) {
      obj.width = frame_width;
      obj.height = (frame_width * img.height) / img.width;
    }
    else {
      obj.width = (frame_height * img.width) / img.height;
      obj.height = frame_height;
    }
  }
  else {
    obj.width = img.width;
    obj.height = img.height;
  }
}

/* 检测skype */
function oopsPopup() {
  alert('您尚未安装"商祺多多-skype",请下载安装.');
  var windowName = "oops";
  var URLtoOpen = "http://www.cocochina.cn/coco-skype/";
  oopswindow = window.open(URLtoOpen, windowName);
  return false;
}

function skypeCheck(num) {
  try {
    new ActiveXObject("Skype.Detection");
    window.location.href = "skype:" + num + "?chat";
    return true;
  }
  catch (e) {
    oopsPopup();
    return false;
  }
}

function IsFormTrim(id, alertText) {
  var obj = document.getElementById(id);
  if (obj.value == "") {
    alert(alertText);
    obj.focus();
    return true;
  }
  else return false;
}